I watched the Nova show on Super Volcanos again and picked up on something new. They were talking about extrapolating temperatures from the oxygen-18 in the ice cores that I referred to earlier in the thread. They said not once but several times, the temperatures were not of the air, but the oceans. If that's true, it makes a big difference because the oceans don't vary nearly as much as the air and change much slower. I've got to look into this.
